contains or indexof in javascript code example

Example 1: check if word is in string javascript

var str = "Hello world, welcome to the universe.";
var n = str.includes("world");

Example 2: how to check whether a string contains a substring in typescript online

const string = "https://dmzlgw-bhdcdev.test.att.com";
const substring = "att.com";

console.log(string.includes(substring));